Quote:
Originally Posted by Frank Reiner
Piston-to-valve interference does not occur at TDC.
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Quote:
Originally Posted by lsmalley
The following photos show the max that the camshaft can advance with the crankshaft at TDC position without any piston to valve interference.
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It most certainly does per my method in respect to the crankshaft. Crankshaft is at TDC. As I slowly rotate the cam, I can see the head beginning to lift up due to the valve beginning to contact the #1/#6 piston as the crankshaft still remains in the TDC position. When I rotate the cam counter-clockwise, the head begins to fall back into place on the block. Doing this on my test engine is how I was able to determine that there would be no interference if I did it to my car. Although, I couldn't tell you to what degree the advancement is, if any, being that the camshaft came with 5° of retard from the factory.